This bug was fixed in the package rsyslog - 8.2001.0-1ubuntu1.1
---------------
rsyslog (8.2001.0-1ubuntu1.1) focal; urgency=medium
* d/rsyslog.postinst: (LP: #1890177)
- Fix Permission denied access to /dev/console
for privilege drop user and group syslog:syslog.
-- Eric Desrochers <eric.desroch...@canonical.com> Tue, 04 Aug 2020
16:19:46 +0000
** Changed in: rsyslog (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1890177
Title:
rsyslogd: file '/dev/console': open error: Permission denied
Status in rsyslog package in Ubuntu:
New
Status in rsyslog source package in Focal:
Fix Released
Bug description:
[Impact]
At the moment rsyslog cannot have access /dev/console due to a
mismatch permission/ownership between '/dev/console' and the Privilege
Drop User and Group 'syslog' in rsyslog.
[Test Case]
* Deploy focal/20.04LTS (tested in gcloud instance)
* Install rsyslog
* systemctl restart rsyslog OR systemctl restart rsyslog
* Inspect /var/log/syslog for the following error:
syslog:Aug 4 14:37:56 <HOSTNAME> rsyslogd: file '/dev/console': open error:
Permission denied [v8.2001.0 try https://www.rsyslog.com/e/2433 ]
[Regression potential]
https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/1890177/comments/4
[Other information]
Other bug:
https://github.com/GoogleCloudPlatform/compute-image-packages/issues/889
[Original description]
The Privilege Drop options ($PrivDrop*) in focal's rsyslog both point
to 'syslog' for the user and group, and don't match the
ownership/permission of '/dev/console' generating the following:
syslog:Aug 3 15:16:58 <HOSTNAME> rsyslogd: file '/dev/console': open
error: Permission denied [v8.2001.0 try https://www.rsyslog.com/e/2433
]
Looking in Bionic/18.04LTS, '/dev/console' used to be root:syslog[1],
nowadays it's root:tty[2]
[1] - Bionic/18.04LTS (Gcloud instance)
# ls -l /dev/console
crw--w---- 1 root syslog 5, 1 Aug 3 15:17 /dev/console
[2] - Focal/20.04LTS (Gcloud instance)
# ls -l /dev/console
crw--w---- 1 root tty 5, 1 Aug 3 17:19 /dev/console
# /etc/rsyslog.conf
$PrivDropToUser syslog
$PrivDropToGroup syslog
** As a debug exercise I did the following:
- Cannot reproduce the situation if I intentionally get rid of the PrivDrop*
options.
- Cannot reproduce the situation if I intentionally add 'syslog' user member
of 'tty' group.
Meaning that it's pretty obvious with the above statement that the
permission denied is caused by the permission/ownership mismatch
between '/dev/console' 's ownership permission & syslog user
(PrivDropTo[User|Group]).
Other bug:
https://github.com/GoogleCloudPlatform/compute-image-packages/issues/889
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